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require 'active_support/core_ext/object/blank'
require 'logger'
require 'active_support/logger'
module ActiveSupport
# Wraps any standard Logger object to provide tagging capabilities.
#
# logger = ActiveSupport::TaggedLogging.new(Logger.new(STDOUT))
# logger.tagged('BCX') { logger.info 'Stuff' } # Logs "[BCX] Stuff"
# logger.tagged('BCX', "Jason") { logger.info 'Stuff' } # Logs "[BCX] [Jason] Stuff"
# logger.tagged('BCX') { logger.tagged('Jason') { logger.info 'Stuff' } } # Logs "[BCX] [Jason] Stuff"
#
# This is used by the default Rails.logger as configured by Railties to make
# it easy to stamp log lines with subdomains, request ids, and anything else
# to aid debugging of multi-user production applications.
module TaggedLogging
module Formatter # :nodoc:
# This method is invoked when a log event occurs.
def call(severity, timestamp, progname, msg)
super(severity, timestamp, progname, "#{tags_text}#{msg}")
end
def tagged(*tags)
new_tags = push_tags(*tags)
yield self
ensure
pop_tags(new_tags.size)
end
def push_tags(*tags)
tags.flatten.reject(&:blank?).tap do |new_tags|
current_tags.concat new_tags
end
end
def pop_tags(size = 1)
current_tags.pop size
end
def clear_tags!
current_tags.clear
end
def current_tags
Thread.current[:activesupport_tagged_logging_tags] ||= []
end
private
def tags_text
tags = current_tags
if tags.any?
tags.collect { |tag| "[#{tag}] " }.join
end
end
end
def self.create(f, formatter, level)
logger = ActiveSupport::Logger.new f
logger.formatter = formatter
logger = new(logger)
logger.level = ActiveSupport::Logger.const_get(level.to_s.upcase)
logger
end
def self.new(logger)
# Ensure we set a default formatter so we aren't extending nil!
logger.formatter ||= ActiveSupport::Logger::SimpleFormatter.new
logger.formatter.extend Formatter
logger.extend(self)
end
delegate :push_tags, :pop_tags, :clear_tags!, to: :formatter
def tagged(*tags)
formatter.tagged(*tags) { yield self }
end
def flush
clear_tags!
super if defined?(super)
end
end
end
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